3/16th of an inch wide on the blue ribs. I use Mytee Cuffs. When I bought my truck mount from Jondon, they gave me new hoses. The ribs on the hoses they gave me was only 2/16th of and inch wide. My cuffs could be pulled off easy and they wouldn't screw in correctly. Talk about Vacuum leaks. I know that using plumbers goop is good, but when the hose is this bad, it's not worth using.
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